The San Diego Padres traded for former Padres pitching prospect RHP Matt Wisler on April 1st, and needed to make room on the roster for him. That led to this transaction earlier today:
The #Padres have optioned RHP Phil Maton to Triple-A El Paso and RHP Matt Wisler has reported to the Major League club and been added to the 25-man roster.— San Diego Padres (@Padres) April 4, 2019
Maton has appeared in 3 games this season, giving up 2 earned runs in 4 total innings pitched. He’s also fairly young, and the Padres have a number of right-handed relief pitchers in their bullpen right now that are older and/or more successful than Maton to this point.
The team has already stated that Wisler will take a long relief role, doing what he can to keep the starting rotation and bullpen fresh as the San Diego Padres start a run of 13 games in 13 days. It would be safe to assume that, after that string of games, Maton will be called back up to the big league club.
There’s also some thought to this being a very quick tryout for Wisler. He’ll definitely get his chances to impress, but he may only have two weeks, and one bad outing could lead to the Padres letting him go once they get back to a more normal schedule with regular off-days.